As New York City is running out of buildable space, “superskinny” or “pencil” structures are becoming more and more popular when it comes to new construction projects.

303 E. 44th St. – Midtown East – rendering

Earlier this year, Manhattan-based Triangle Assets filed plans with the New York City Department of Buildings for a slender residential tower at 303 E. 44th St. in Midtown East, near the United Nations.

The 1,851-square-foot site is currently occupied by a three-story mixed-use building. According to the New York Daily News, Triangle Assets‘ new pencil tower will feature 2,600-square-foot floor plates. This means that the proposed tower’s footprint will be around 30 percent smaller than the size of those other skinny structures that are popping up in the city—such as 432 Park at 57th Street, which is going up from a base of 93 feet by 93 feet.

Designed by the architectural firm ODA, the superskinny tower will stand 41 stories tall. If approved for construction, it will offer 44 luxury apartments, a sauna, spa, swimming pool, fitness center, lounge and business center. The lower floors will have one- and two-bedroom units, and full-floor apartments will begin on the 22nd floor. The 40th and 41st floors will be occupied by a duplex.

Apart from being extremely slender, the residential tower proposed at 303 E. 44th St. will stand out with its floating full-floor gardens. As revealed by the Daily News, design plans call for six “green” gaps built in the façade, each 16 feet high and featuring canopied green terraces built around the core of the tower.

If the Department of Buildings votes in favor of Triangle Assets’ project proposal, construction at the 96,774-square-foot tower is scheduled to start in September and wrap up by late 2017.